Hire an attorney! This is difficult... trust me... it's a loaded question!

If offered a plea deal from prosecutor and they change prosecutors does offer from first prosecutor exist still?

Yes. Unless revoked. And if they try to say no, complain like crazy and you'll get it back.

Iam on unsupervised probation, and recently got another charge will I get jail time or supervised probation

Never settle for Jail! Push! Hire someone to fight... what else do you have to lose? Likely to just get concurrent sup probation! Come on......

Can I fly from Denver to Seattle with marijuana?

No you can't legally and yes, you could get prosecuted.

What will happen to me when I go to court for third degree assault charges? First time!

Ask for diversion or a deferred judgment... if DA says no, then hire an attorney to work for that!!

Where do I began?

If you want some info on your own first: http://www.courts.state.co.us/Forms/Forms_List.cfm?Form_Type_ID=94

I have a restraining order against me, i am being accused of domestic but the police was there a little bit afterwards, and

Plead not guilty and fight your case. DV convictions are not good and you have a good chance in front of a jury if it is she said / he said. Get...